21321401099 has 2 divisors, whose sum is σ = 21321401100. Its totient is φ = 21321401098.

The previous prime is 21321401077. The next prime is 21321401113. The reversal of 21321401099 is 99010412312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21321401099 - 2⁸ = 21321400843 is a prime.

It is not a weakly prime, because it can be changed into another prime (21321401039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660700549 + 10660700550.

It is an arithmetic number, because the mean of its divisors is an integer number (10660700550).

Almost surely, 2^21321401099 is an apocalyptic number.

21321401099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321401099 is an equidigital number, since it uses as much as digits as its factorization.

21321401099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 32.

The spelling of 21321401099 in words is "twenty-one billion, three hundred twenty-one million, four hundred one thousand, ninety-nine".